The ultrasonic group velocity and attenuation were measured as a function of frequency for longitudinal and shear waves in the epoxy matrix (3501-6) and in the principal directions of the unidirectional graphite/epoxy composite (AS/3501-C). Tests were conducted in the frequency ranges 0.25 MFIz to 14 MHz and 0.5 MHz to 3 MHz for longitudinal and shear wave modes, respectively. While the attenuation increased with frequency for all wave modes, the group velocity was independent of frequency for...
Topics: DTIC Archive, Williams, James H., Jr., MASSACHUSETTS INST OF TECH CAMBRIDGE, *ACOUSTIC WAVES,...
Open hole and mechanically fastened joint specimens employing three different symmetric stacking sequences were used for this project. Replicates for each specimen type and stacking sequence were loaded to ultimate and four load levels below ultimate to produce specimens containing progressive amounts of damage. During loading of each specimen Acoustic Emissions (AE) were monitored as a function of load. Specimens from each of the four load levels were inspected for matrix cracking,...
Topics: DTIC Archive, Freeman,S M, LOCKHEED-GEORGIA CO MARIETTA, *Composite materials, *Epoxy compounds,...
The oxidation in air of nickel-silicon alloys with compositions extending from 5 to 20 weight-silicon have been studied over the temperature interval between 900 and 1100 degs C. In the case of alloys with less than 20% silicon, the silicon is not oxidized internally nevertheless the rates of oxidation are greater than those for alloys upon which alumina scales are formed. The alloy with 20% silicon exhibited oxidation rates less than those associated with alumina scales under similar...
Topics: DTIC Archive, Meier,G H, PITTSBURGH UNIV PA DEPT OF METALLURGICAL AND MATERIALS ENGINEERING,...
An experimental technique is developed to impose a planar lateral confinement in a prismatic specimen (with rectangular cross-section); the setup enabled a controlled and homogeneous stress state with high lateral compressive stresses. A transparent polycrystalline aluminum oxynitride (AlON) specimen was used for the study. The statically pre-compressed specimen was then subjected to axial dynamic compressive loading using a modified compression Kolsky bar setup. Experimental design was...
Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *COMPRESSION, *CERAMIC MATERIALS,...
The normal spectral emittance of Inconel and type 321 stainless steel with different surface treatments was measured at temperatures of 900, 1,200, 1,500, and 1,800 F over a wavelength range of 1.5 to 15 microns. The measurements involved comparison of the radiant energy emitted by the heated specimen with that emitted by a comparison standard at the same temperature by means of a recording double-beam infrared spectrophotometer. The silicon carbide comparison standard had previously been...
Topic: NASA Technical Reports Server (NTRS)
The effect of thermal-cycling-induced microcracking in fiber-reinforced polymer matrix composites is studied. Specific attention is focused on microcrack density as a function of the number of thermal cycles, and the effect of microcracking on the dimensional stability of composite materials. Changes in laminate coefficient of thermal expansion (CTE) and laminate stiffness are of primary concern. Included in the study are materials containing four different Thornel fiber types: a PAN-based T50...
Topics: NASA Technical Reports Server (NTRS), FIBER COMPOSITES, LAMINATES, MICROCRACKS, POLYMER MATRIX...
Criteria, using fundamental thermochemical dynamics, were developed to assist a scientist using the Drop Tube Facility in designing a good experiment. The types of parameters involved in designing the experiments include the type of furnace, the type of atmosphere, and in general which materials are better behaved than others as determined by past experience in the facility. One of the major advantages of the facility lies in its ability to provide large undercoolings in the cooling curve...
Topics: NASA Technical Reports Server (NTRS), DROP TOWERS, EXPERIMENT DESIGN, SOLIDIFICATION,...
Three-dimensional finite-element analyses of middle-crack tension (M-T) and bend specimens subjected to mode I loadings were performed to study the stress singularity along the crack front. The specimen was modeled using 20-node isoparametric elements. The displacements and stresses from the analysis were used to estimate the power of singularities using a log-log regression analysis along the crack front. The analyses showed that finite-sized cracked bodies have two singular stress fields of...
Topics: NASA Technical Reports Server (NTRS), BEND TESTS, BOUNDARY LAYERS, CRACK PROPAGATION, CRACKS,...
Spur gear endurance tests and rolling-element surface fatigue tests are conducted to investigate EX-53 and CBS 1000M steels for use as advanced application gear materials, to determine their endurance characteristics, and to compare the results with the standard AISI 9310 gear material. The gear pitch diameter is 8.89 cm (3.50 in). Gear test conditions are an oil inlet temperature of 320 K (116 F), an oil outlet temperature of 350 K (170 F), a maximum Hertz stress of 1.71 GPa (248 ksi), and a...
Topics: NASA Technical Reports Server (NTRS), AMBIENT TEMPERATURE, FAILURE ANALYSIS, FATIGUE LIFE,...
A systematic experimental evaluation of whisker and particulate reinforced aluminum matrix composites was conducted to assess the variation in tensile properties with reinforcement type, volume fraction, and specimen thickness. Each material was evaluated in three thicknesses, 1.8, 3.18, and 6.35 mm, to determine the size, distribution, and orientation of the reinforcements. This information was used to evaluate several micromechanical models that predict composite moduli. The longitudinal and...
Topics: NASA Technical Reports Server (NTRS), METAL MATRIX COMPOSITES, MICROMECHANICS, MICROSTRUCTURE,...
An inspection procedure for a step-lap joint problem is reviewed in detail in this report. Rather than study the mechanics of bonding and the relationship of performance to many manufacturing and service variables, it is proposed to examine the potential of selected ultrasonic signal features and their ability for predicting performance of an adhesively bonded structure. Emphasis is placed on studying the disbond type problem. Adhesive problems are considered; not cohesive. The adhesive problem...
Topics: DTIC Archive, Raisch, Jack W., DREXEL UNIV PHILADELPHIA PA, *PATTERN RECOGNITION, *ADHESIVES,...
2
2.0
Jun 30, 2018
06/18
by
Arnold Wiliem; Peter Hobson; Brian C. Lovell
texts
eye 2
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Recently, there has been a growing interest in developing Computer Aided Diagnostic (CAD) systems for improving the reliability and consistency of pathology test results. This paper describes a novel CAD system for the Anti-Nuclear Antibody (ANA) test via Indirect Immunofluorescence protocol on Human Epithelial Type 2 (HEp-2) cells. While prior works have primarily focused on classifying cell images extracted from ANA specimen images, this work takes a further step by focussing on the specimen...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition, Computational Engineering,...
Source: http://arxiv.org/abs/1407.7330
2
2.0
Jun 29, 2018
06/18
by
Ruixi Li
texts
eye 2
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Automatic classification of Human Epithelial Type-2 (HEp-2) cells staining patterns is an important and yet a challenging problem. Although both shallow and deep methods have been applied, the study of deep convolutional networks (CNNs) on this topic is shallow to date, thus failed to claim its top position for this problem. In this paper, we propose a novel study of using CNNs for HEp-2 cells classification focusing on cross-specimen analysis, a key evaluation for generalization. For the first...
Topics: Computer Vision and Pattern Recognition, Computing Research Repository
Source: http://arxiv.org/abs/1604.05816
3
3.0
Jun 29, 2018
06/18
by
H. -J. Chang; J. Segurado; J. M. Molina-Aldareguía; R. Soler; J. LLorca
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The mechanical behavior in compression of [111] LiF micropillars with diameters in the range 0.5 $\mu$m to 2.0 $\mu$m was analyzed by means of discrete dislocation dynamics at ambient and elevated temperature. The dislocation velocity was obtained from the Peach-Koehler force acting on the dislocation segments from a thermally-activated model that accounted for the influence of temperature on the lattice resistance. A size effect of the type "smaller is stronger" was predicted by the...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1607.08642
13
13
Oct 26, 2014
10/14
by
Aboelenen, Ahmed; El-Hawary, Amira Kamal; Megahed, Nirmeen; Zalata, Khaled refaat; El-Salk, Eman M.; Fattah, Marwa Abdel; Sorogy, Mohamed El; Shehta, Ahmed
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This article is from International Journal of Surgery Case Reports , volume 5 . Abstract INTRODUCTION: Cases of primary neuroendocrine tumors in the liver combined with hepatocellular carcinoma are scarce. Such cases could present either as combined-type tumor or collision type. PRESENTATION OF CASE: A 51-year-old man presented with a mass in the right hemiliver. Serum level of alpha-fetoprotein was slightly elevated (2.3 ng/ml), with normal CA19-9 and CA125. The patient underwent right...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3907205
79
79
Oct 23, 2014
10/14
by
Svenson, Gavin J.
texts
eye 79
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This article is from ZooKeys . Abstract AbstractThe praying mantis genus Liturgusa Saussure, 1869 occurs only in Central and South America and represents the most diverse genus of Neotropical Liturgusini (Ehrmann 2002). The genus includes bark dwelling species, which live entirely on the trunks and branches of trees and run extremely fast. All species included within the genus Liturgusa are comprehensively revised with a distribution stretching from central Mexico, the island of Dominica to the...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3978261
Unidirectional and angleply multifiber laminates were tested for improved impact strength and other mechanical properties. The effects of several variables on the mechanical properties of epoxy matrix materials were described. These include fiber type (HMS and AS graphites, glass, and Kevlar 49), ratio of primary to hybridizing fiber and hybrid configuration. It is demonstrated that AS graphite/S glass in an intraply configuration results in the best combination of static and Charpy impact...
Topics: NASA Technical Reports Server (NTRS), FABRICATION, LAMINATES, MECHANICAL PROPERTIES, STRUCTURAL...
4
4.0
Jun 30, 2018
06/18
by
R. Dhote; M. Fabrizio; R. Melnik; J. Zu
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In this paper, a macroscopic three dimensional non-isothermal model is proposed to describe hysteresis phenomena and phase transformations in shape memory alloys (SMAs). The model is of phase-field type and is based on the Ginzburg-Landau theory. The hysteresis and phase transformations are governed by the kinetic phase evolution equation using the scalar order parameter, conservation laws of momentum and energy, and a non-linear coupling between stress, strain, and the order parameter in a...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1403.5340
Since October 1985, all civilian applicants for U.S. military service have been screened for antibodies to human immunodeficiency virus, type 1 (HIV-1) during pre-induction medical examinations at Military Entrance Processing Stations (MEPS). Since 1986, all members of active and reserve components of the U.S. Armed Forces have been periodically screened for antibodies to HIV-1.1 This report summarizes prevalences and trends of new diagnoses of HIV-1 infection among civilian applicants for...
Topics: DTIC Archive, ARMED FORCES HEALTH SURVEILLANCE CENTER SILVER SPRING MD, *DIAGNOSIS(MEDICINE),...
"Remarks on Lanius robustus (Baird), Based upon an Examination of the Type Specimen" is an article from Proceedings of the Academy of Natural Sciences of Philadelphia, Volume 37 . View more articles from Proceedings of the Academy of Natural Sciences of Philadelphia . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-4061096
Source: http://www.jstor.org/stable/10.2307/4061096
54
54
May 25, 2017
05/17
by
Becker, Paul R.; Porter, Barbara J.; Mackey, Elizabeth A.; Schantz, Michele M.; Demiralp, Rabia; Wise, Stephen A.
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Topics: National Marine Mammal Tissue Bank (U.S.), Environmental specimen banking--United States, Marine...
Biodiversity Heritage Library
120
120
Dec 29, 2017
12/17
by
National Museum of Natural History (U.S.) Pacific Ocean Biological Survey Program
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The Pacific Ocean Biological Survey Program (POBSP) was initiated in 1962 when the Smithsonian Institution entered into a grant agreement with the Department of Defense. From January 1963 through June 1969 Smithsonian Institution employees undertook biological surveys in an area of the Pacific Ocean spanning the equator and extending from latitude 30 degrees north to 10 degrees south and from longitude 150 degrees east to 180 degrees west, an area dotted with clusters of islands and atolls. The...
Topics: National Museum of Natural History (U.S.) Pacific Ocean Biological Survey Program,...
293
293
Jan 6, 2019
01/19
by
製文堂 Seibundo
texts
eye 293
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Shueisha SEIBUNDO Type Sepcimen 1903, Tokyo. Western fonts from first page (LtR), and Japanese fonts from last page (RtL). 秀英舎鋳造部 活版製造所 製文堂『活版見本帖』明治36年
Topics: Type specimen book, 活字見本, 活版見本, Japanese type, Japanese typefoundry, Shueisya,...
Benchmark for Faithful Digital Reproductions of Monographs and Serials. Version 1. December 2002
Topics: Solotype Typographers, Type and type-founding
Benchmark for Faithful Digital Reproductions of Monographs and Serials. Version 1. December 2002
Topics: Type and type-founding, Printing
California Digital Library
2,570
2.6K
Nov 18, 2008
11/08
by
Poole, George William; Buzzell, Jonathan John
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eye 2,570
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p. 121-489 (specimen letters) autographed from type-written copy
Topics: Commercial correspondence, Selling
5,282
5.3K
Sep 30, 2019
09/19
by
Ludwig and Mayer
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Antiqua Candida, a type specimen by German Foundry Ludwig and Mayer. From the collection of Letterform Archive . To schedule a visit, please click here.
Topic: Type Specimen
4,829
4.8K
Oct 9, 2019
10/19
by
Ludwig and Mayer
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Halbfette Federgrotesk, a type specimen by German foundry Ludwig and Mayer. From the collection of Letterform Archive . To schedule a visit, please click here.
Topic: Type Specimen
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45
Jul 26, 2016
07/16
by
Richards, Lloyd E.; Robinson, Henry E.
texts
eye 45
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Topics: Metals--Thermal conductivity, Thermocouples--Calibration
California Digital Library
3,949
3.9K
Oct 31, 2007
10/07
by
Palmer & Rey, Firm, Type-founders, San Francisco
texts
eye 3,949
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Microfilm
Topics: Printing, Type and type-founding, Book ornamentation
The effect of texture, (0002) poles in the transverse direction, on the notched and fretting fatigue life of a Ti-4Al-4V alloy was examined. Notched fatigue and pin-loaded flat fretting fatigue specimens were tested at room temperature in the longitudinal and transverse directions and compared to smooth bar fatigue results. Fractured fretting fatigue specimens were examined with the scanning electron microscope. Indications are that no fretting or notch fatigue anisotropy exists for the...
Topics: DTIC Archive, Zarkades,Anthone, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA, *FATIGUE...
The effect of texture, (0002) poles in the transverse direction, on the notched and fretting fatigue life of a Ti-4Al-4V alloy was examined. Notched fatigue and pin-loaded flat fretting fatigue specimens were tested at room temperature in the longitudinal and transverse directions and compared to smooth bar fatigue results. Fractured fretting fatigue specimens were examined with the scanning electron microscope. Indications are that no fretting or notch fatigue anisotropy exists for the...
Topics: DTIC Archive, Zarkades,Anthone, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA, *FATIGUE...
The contrast sensitivity of the radiographic amplifiers, both the storage type and nonstorage type, their absolute sensitivity, and the reproducibility of fabrication were investigated. The required 2-2T quality level was reached with the radiographic storage screen. The sensitivity threshold was 100 to 200 mR with 45 to 100 kV filtered X-rays. The quality level of the radiographic amplifier screen (without storage) was 4-4T; for a 6 mm (0.25 in.) thick aluminum specimen, a 1 mm (0.040 in.)...
Topics: NASA Technical Reports Server (NTRS), AMPLIFIER DESIGN, IMAGE INTENSIFIERS, RADIOGRAPHY, SOLID...
19
19
Dec 6, 2019
12/19
by
G A Boulenger
texts
eye 19
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The construction, calibration, and properties of a facility for measuring sound transmission through aircraft type panels are described along with the theoretical and empirical methods used. Topics discussed include typical noise source, sound transmission path, and acoustic cabin properties and their effect on interior noise. Experimental results show an average sound transmission loss in the mass controlled frequency region comparable to theoretical predictions. The results also verify that...
Topics: NASA Technical Reports Server (NTRS), ACOUSTIC ATTENUATION, GENERAL AVIATION AIRCRAFT, NOISE...
195
195
Oct 28, 2015
10/15
by
Stelfox, Arthur Wilson, 1883-1972
texts
eye 195
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restrictions: Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu.
Topics: Entomology, Hymenoptera
The notebook documents Waldo Schmitt's work during the Walter Rathbone Bacon Traveling Scholarship Expedition to the West Coast of South America, 1926-1927. Station data covers stations 70-127, January 31, 1927 - May 18, 1927. Entries are numbered and detail locations, collecting site conditions, date, and sometimes a combination of type of specimen (by scientific or common name), time of day, tide position, density measurements, water and air temperatures, sketches of specimens. Sometimes...
Topics: Walter Rathbone Bacon Traveling Scholarship Expedition (1925-1927), Zoology, Crustaceans
7
7.0
Dec 10, 2020
12/20
by
J.-C. Massary; M. S. Hoogmoed; M. Blanc
texts
eye 7
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2,990
3.0K
Mar 13, 2011
03/11
by
Typefounders of Chicago
texts
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Type specimen book for foundry metal type issued by the Neon Type Division of Typefounders of Chicago (itself a trade name of Castcraft). Typefounders of Chicago acquired the Neon Type Foundry (Pittsburgh) in 1959. This catalog has been uploaded to The Internet Archive in two parts (due to technical issues involving limited bandwidth); this is part 2. For part 1 see: http://www.archive.org/details/NeonTypeDivisionTypefoundersChicago1962pt1
Topics: typefounding, typecasting, type specimen
13
13
Oct 24, 2014
10/14
by
Baseskiogulu, Barbaros; Canaz, Funda; Kaya, Coskun; Donmez, Turgut
texts
eye 13
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This article is from Urology Annals , volume 5 . Abstract T-lymphocytic infiltration near the tumor site is an expected immune response in bladder cancers. However, reports of patients with bladder cancer exhibiting small lymphocytic infiltration of the bladder tissue are very rare in the literature. Here, the patient was presented to our group with hematuria, but subsequently diagnosed as exhibiting invasive bladder cancer and chronic lymphocytic leukemia with suspicious lymphocytic...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3643325
794
794
Oct 19, 2011
10/11
by
American Type Founders
texts
eye 794
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One-line specimen book for American Type Founders letterpress printing type. Printing code: TY-131 40M656LC, which identifies it as dating from June 1956. This particular copy has with it an insert which contains on one side an ATF "Handy Order Blank, ATF form TY-134 50M756LC, and on the other side an advertisement for Perfection Type, Inc. (Minneapolis) in their capacity as an authorized ATF type dealer. (N.B., a fold-over tab in this insert had glued itself shut with age and since it...
Topics: typefounding, type
848
848
Oct 9, 2011
10/11
by
American Type Founders Company
texts
eye 848
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American Type Founders Company catalog of "handypacks" of letterpress printing type. The specimen itself bears no date, but the enclosed order form bears a printing code which dates it to February, 1950.
Topic: typefounding
137
137
Apr 18, 2017
04/17
by
Hamlin, Hannibal, d. 1982; American Museum of Natural History. Department of Ornithology. Whitney South Sea Expeditions Collection; American Museum of Natural History; Whitney South Sea Expedition of the American Museum of Natural History (1920-1941)
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Handwritten in pencil. Sheets likely taken from a carbon copy notebook
Topics: Birds, Description and travel, Travel, Scientific expeditions, Hamlin, Hannibal, d. 1982, France...
2
2.0
Jun 30, 2018
06/18
by
M. J. G. Cottet; M. Cantoni; B. Mansart; D. T. L. Alexander; C. Hebert; N. D. Zhigadlo; J. Karpinski; F. Carbone
texts
eye 2
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Imaging of flux vortices in high quality MgB$_2$ single crystals has been successfully performed in a commercial Field Emission Gun-based Transmission Electron Microscope. In Cryo-Lorentz Microscopy, the sample quality and the vortex lattice can be monitored simultaneously, allowing one to relate microscopically the surface quality and the vortex dynamics. Such a vortex motion ultimately determines the flow resistivity, $\rho_{f}$, the knowledge of which is indispensable for practical...
Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1401.4062
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37
Jul 26, 2016
07/16
by
Robinson, Henry E.; Powell, Frank J.
texts
eye 37
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14
14
Oct 23, 2014
10/14
by
Aggarwal, Vivek; Singla, Mamta; Yadav, Suman; Yadav, Harish; Sharma, Vikram; Bhasin, Saranjit Singh
texts
eye 14
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This article is from Journal of Conservative Dentistry : JCD , volume 17 . Abstract Aim:: The purpose of the present study was to comparatively evaluate the effect of presence of a 2 mm ferrule and different type of dowels on fracture resistance of mandibular premolars. Materials and Methods:: Fifty uniradicular mandibular premolars were divided into five groups (n = 10). Ten teeth received no treatment (group I). Samples in group II & III were decoronated 2 mm above cemento-enamel junction...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4001279
This article describes ways to incorporate high-precision measurements of the specific gravities of minerals into undergraduate courses in mineralogy and physical geology. Most traditional undergraduate laboratory methods of measuring specific gravity are suitable only for unusually large samples, which severely limits their usefulness for student projects involving minerals in ordinary rocks of the sort usually encountered by working geologists. To overcome this limitation, a custom-built...
Topics: ERIC Archive, Measurement Techniques, Undergraduate Study, Mineralogy, Geology, College Science,...
11
11
Oct 29, 2014
10/14
by
Hammami, Mohamed; Noomen, Faouzi; Toumi, Omar; Harzallah, Olfa; Mahmoudi, Ammar; Kallel, Wassim; Zouari, Khadija; Hamdi, Abdelaziz
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This article is from North American Journal of Medical Sciences , volume 3 . Abstract Context:: Autoimmune pancreatitis is a particular type of pancreatitis of presumed autoimmune etiology, it is an entity distinct from all others forms of chronic pancreatitis, characterized by clinical, histopathological, radiographic, serologic and therapeutic features. This benign disease resembles pancreatic carcinoma both clinically and radiographically. Case Report:: A 27-year-old man presented with...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3271410
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14
Oct 23, 2014
10/14
by
Dolan, Paul; Rudisill, Caroline
texts
eye 14
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This article is from Social Science & Medicine (1982) , volume 105 . Abstract Financial incentives have been used in a variety of settings to motivate behaviors that might not otherwise be undertaken. They have been highlighted as particularly useful in settings that require a single behavior, such as appointment attendance or vaccination. They also have differential effects based on socioeconomic status in some applications (e.g. smoking). To further investigate these claims, we tested the...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3969100
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13
Oct 23, 2014
10/14
by
Gabali, Ali M; Jazaerly, Tarek; Chang, Chung-Che (Jeff); Cleveland, Ronald; Kass, Lawrence
texts
eye 13
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This article is from Avicenna Journal of Medicine , volume 4 . Abstract Hepatosplenic T-cell lymphoma (HSTL) is a rare T-cell neoplasm of the lymphoid system. This type of lymphoma is characterized by sinusoidal infiltration of spleen, liver, bone marrow and lymph nodes by neoplastic lymphocytes. Here, we discuss a patient who had a left axillary lymph node biopsy with characteristic histological and immunohistochemical features of HSTL. In addition, infiltrating neoplastic T-cells and...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3994706
